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Percent Composition

Percent Composition. Percent by mass of a particular element in a compound % Element = Mass of Element x 100 Mass of Compound. Example. Find the percentage composition of copper (I) sulfide. Practice. Find the percent of nitrogen in (NH 4 ) 2 CO 3

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Percent Composition

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  1. Percent Composition

  2. Percent by mass of a particular element in a compound % Element = Mass of Element x 100 Mass of Compound

  3. Example Find the percentage composition of copper (I) sulfide.

  4. Practice • Find the percent of nitrogen in (NH4)2CO3 • Find the percent composition of Ba(NO3)2

  5. Hydrates • Some salt crystals bind water molecules in their crystal structure – called hydrates • The formula below shows a hydrate with a ratio of 10 water molecules per one salt molecule Na2CO3 • 10 H2O

  6. Example • Find the percent of water in Na2CO3 • 10 H2O

  7. Practice • Find the percent of water in ZnSO4• 7H2O

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